FR2860974A1 - Lumbar disc prosthesis has ceramic inserts with matching convex and concave surfaces fastened to upper and lower plates fixed to vertebrae - Google Patents
Lumbar disc prosthesis has ceramic inserts with matching convex and concave surfaces fastened to upper and lower plates fixed to vertebrae Download PDFInfo
- Publication number
- FR2860974A1 FR2860974A1 FR0312144A FR0312144A FR2860974A1 FR 2860974 A1 FR2860974 A1 FR 2860974A1 FR 0312144 A FR0312144 A FR 0312144A FR 0312144 A FR0312144 A FR 0312144A FR 2860974 A1 FR2860974 A1 FR 2860974A1
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- Prior art keywords
- insert
- plate
- plates
- disc prosthesis
- vertebrae
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- 239000000919 ceramic Substances 0.000 title abstract 2
- 239000012528 membrane Substances 0.000 claims abstract description 7
- 229910010293 ceramic material Inorganic materials 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 5
- 230000004075 alteration Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 210000004705 lumbosacral region Anatomy 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003349 osteoarthritic effect Effects 0.000 description 1
- 210000004417 patella Anatomy 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
- A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30721—Accessories
- A61F2/30742—Bellows or hose-like seals; Sealing membranes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30383—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by laterally inserting a protrusion, e.g. a rib into a complementarily-shaped groove
- A61F2002/30387—Dovetail connection
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30433—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30621—Features concerning the anatomical functioning or articulation of the prosthetic joint
- A61F2002/30649—Ball-and-socket joints
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/44—Joints for the spine, e.g. vertebrae, spinal discs
- A61F2/442—Intervertebral or spinal discs, e.g. resilient
- A61F2/4425—Intervertebral or spinal discs, e.g. resilient made of articulated components
- A61F2002/443—Intervertebral or spinal discs, e.g. resilient made of articulated components having two transversal endplates and at least one intermediate component
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0041—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using additional screws, bolts, dowels or rivets, e.g. connecting screws
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00179—Ceramics or ceramic-like structures
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
Description
L'objet de l'invention concerne une prothèse discale pour vertèbres enThe subject of the invention relates to a disc prosthesis for vertebrae in
particulier lombaires destinée à être substituée aux disques fibrocartilagineux assurant la liaison entre les vertèbres lombaires de la colonne vertébrale. particular lumbar spine intended to be substituted for fibrocartilaginous discs providing the connection between the lumbar vertebrae of the spine.
Il est connu qu'un disque intervétébral peut subir des altérations telles que tassements, déformations, déplacements ou usures et plus généralement, une dégénérescence associée à des contraintes mécaniques qui lui sont impliquées et conduisent à une destruction anatomique et fonctionnelle du disque et du segment vertébral. Cette altération discale modifie le comportement mécanique du disque et aboutit à une diminution de la hauteur de l'espace intersomatique, laquelle entraîne une perturbation de l'ensemble fonctionnel articulaire. Il en résulte une instabilité induisant en particulier une réaction arthrosique, source de douleurs et de processus ostéophytiques. It is known that an intervertebral disc may undergo alterations such as settlements, deformations, displacements or wear and more generally, a degeneration associated with mechanical stresses involved in it and lead to an anatomical and functional destruction of the disc and the vertebral segment. . This disc alteration modifies the mechanical behavior of the disc and results in a reduction in the height of the intersomatic space, which causes a disruption of the articular functional assembly. This results in instability inducing in particular an osteoarthritic reaction, source of pain and osteophytic processes.
Il a donc été proposé de remplacer le disque déficient par un disque artificiel dont différents types de réalisation ont été envisagés. Ainsi, il est connu par exemple notamment par le brevet FR 2 594 882, une prothèse discale pour vertèbres lombaires comportant une première et une deuxième plaques de fixation aux vertèbres voisines, réalisées en un matériau métallique. Entre les deux plaques est interposée une rotule d'articulation comportant un premier insert monté sur une des plaques et composé d'une calotte sphérique coopérant avec une cupule sphérique d'un deuxième insert monté sur l'autre plaque. Les inserts se présentent sous forme de pastilles réalisées par exemple en un matériau céramique biocompatible présentant des caractéristiques tribologiques améliorées, notamment en ce qui concerne sa résistance à l'usure. Une telle prothèse comporte également un anneau d'amortissement placé autour de la rotule entre les deux plaques. It has therefore been proposed to replace the deficient disk by an artificial disk of which different types of embodiments have been envisaged. Thus, for example, it is known, for example, from patent FR 2 594 882, a disc prosthesis for lumbar vertebrae comprising a first and a second attachment plate to the neighboring vertebrae, made of a metallic material. Between the two plates is interposed a ball joint comprising a first insert mounted on one of the plates and composed of a spherical cap cooperating with a spherical cup of a second insert mounted on the other plate. The inserts are in the form of pellets made for example of a biocompatible ceramic material having improved tribological characteristics, especially as regards its resistance to wear. Such a prosthesis also comprises a damping ring placed around the patella between the two plates.
Si une telle prothèse lombaire permet de restaurer une hauteur convenable à l'espace intersomatique, la rotule d'articulation de cette prothèse présente des frottements importants sur une surface réduite, la rendant ainsi sensible à l'usure compte tenu des contraintes importantes et localisées que subissent les inserts. Dans le même sens, les pastilles sont engagées dans des trous coniques aménagés dans les plaques de fixation, lors de l'opération de relâchement de la distraction imposée aux corps vertébraux recevant les plaques. Il s'ensuit qu'un montage correct est relativement délicat à mener à bien de sorte que la rotule d'articulation travaille dans des conditions anormales. If such a lumbar prosthesis makes it possible to restore a height that is suitable for the intersomatic space, the hinge joint of this prosthesis has considerable friction on a reduced surface, thus making it sensitive to wear, given the important and localized stresses that undergo the inserts. In the same direction, the pellets are engaged in conical holes formed in the fixing plates, during the operation of relaxation of the distraction imposed on the vertebral bodies receiving the plates. It follows that a correct mounting is relatively difficult to carry out so that the hinge joint works in abnormal conditions.
L'objet de l'invention vise donc à remédier aux inconvénients de la technique antérieure en proposant une prothèse en particulier lombaire conçue pour être pratiquement insensible aux phénomènes d'usure et de brisure, tout en étant adaptée pour autoriser une mobilité physiologique entre les deux vertèbres lombaires instrumentées. The object of the invention is therefore to overcome the drawbacks of the prior art by providing a particular lumbar prosthesis designed to be virtually insensitive to wear and tear phenomena, while being adapted to allow a physiological mobility between the two instrumented lumbar vertebrae.
Pour atteindre son objectif, la prothèse selon l'invention comporte: É une première et une deuxième plaques destinées à être fixées à des 10 vertèbres voisines, É et une rotule d'articulation interposée entre les deux plaques montées en position superposée et comportant - une calotte sphérique aménagée sur un premier insert réalisé en un matériau céramique et monté sur la première plaque, - et une cupule sphérique coopérant avec la calotte sphérique et aménagée sur un deuxième insert réalisé en un matériau céramique et monté sur la deuxième plaque. To achieve its objective, the prosthesis according to the invention comprises: É a first and a second plate intended to be fastened to neighboring vertebrae, É and a hinge joint interposed between the two plates mounted in superposed position and comprising a spherical cap fitted on a first insert made of a ceramic material and mounted on the first plate, - and a spherical cup cooperating with the spherical cap and arranged on a second insert made of a ceramic material and mounted on the second plate.
Selon l'invention: É chaque insert est monté sur une plaque à l'aide d'une liaison glissière et 20 d'une liaison ponctuelle d'arrêt en translation, É la rotule d'articulation est au moins partiellement entourée par une membrane élastique fixée aux deux plaques de manière que ces dernières soient reliées entre elles. According to the invention: E each insert is mounted on a plate by means of a sliding connection and a stop link in translation, E the articulation ball is at least partially surrounded by an elastic membrane attached to the two plates so that the latter are connected to each other.
Selon une variante préférée de réalisation, la liaison glissière est une liaison du 25 type à queue d'aronde réalisée entre une plaque et un insert. According to a preferred embodiment, the slide connection is a dovetail type connection made between a plate and an insert.
Selon une variante préférée de réalisation, chaque liaison ponctuelle est constituée par un téton d'arrêt traversant un alésage réalisé dans une plaque et débouchant dans un trou borgne aménagé dans un insert. According to a preferred embodiment, each point link is constituted by a stop pin passing through a bore formed in a plate and opening into a blind hole formed in an insert.
Avantageusement, la prothèse discale comporte un élément d'amortissement 30 interposé entre chaque insert et une plaque. Advantageously, the disc prosthesis comprises a damping element 30 interposed between each insert and a plate.
De préférence, la cupule sphérique et la calotte sphérique présentent des dimensions sensiblement identiques légèrement inférieures aux dimensions des plaques. Preferably, the spherical cup and the spherical cap have substantially identical dimensions slightly smaller than the dimensions of the plates.
Diverses autres caractéristiques ressortent de la description faite cidessous en référence aux dessins annexés qui montrent, à titre d'exemples non limitatifs, des formes de réalisation de l'objet de l'invention. Various other characteristics appear from the description given below with reference to the accompanying drawings which show, by way of non-limiting examples, embodiments of the subject of the invention.
La fig. 1 est une vue en perspective montrant un exemple de réalisation d'une prothèse conforme à l'invention. Fig. 1 is a perspective view showing an exemplary embodiment of a prosthesis according to the invention.
La fig. 2 est une vue en perspective en partie éclatée montrant une prothèse 10 conforme à l'invention. Fig. 2 is a partially exploded perspective view showing a prosthesis 10 according to the invention.
La fig. 3 est une vue en coupe-élévation prise sensiblement dans le plan sagittal. Fig. 3 is a sectional elevation view taken substantially in the sagittal plane.
La fig. 4 est une vue en coupe-élévation prise sensiblement dans un plan transversal d'une prothèse conforme à l'invention. Fig. 4 is a sectional elevation view taken substantially in a transverse plane of a prosthesis according to the invention.
Tel que cela ressort plus précisément des fig. 1 à 4, l'objet de l'invention concerne une prothèse en particulier lombaire 1 destinée à être implantée à la place d'un disque entre deux vertèbres adjacentes. La prothèse discale 1 selon l'invention comporte une première plaque 2 dite supérieure dans l'exemple illustré et une deuxième plaque 3 dite inférieure. Les plaques 2, 3 sont destinées à être fixées à des vertèbres voisines et présente chacune une face externe respectivement 21, 31 de dimensions sensiblement similaires et adaptées pour épouser approximativement le contour des surfaces articulaires associées. Chaque plaque 2, 3, comporte également une face interne respectivement 22 et 32, s'étendant en vis-à-vis l'une de l'autre. Chaque plaque 2, 3 présente un bord postérieur respectivement 2a, 3a s'étendant à l'opposé d'un bord antérieur 2b, 3b respectivement. Le bord antérieur 2b, 3b de chaque plaque 2, 3 est relié au bord postérieur 2a, 3a respectif à l'aide de deux bords latéraux 2c, 3c opposés l'un de l'autre. De préférence, dans un plan transversal T perpendiculaire au plan sagittal S en considération des plans anatomiques, le bord postérieur 2a, 3a de chaque plaque présente un profil concave, tandis que le bord antérieur 2b, 3b présente un profil convexe. Dans ce même plan transversal T, les bords latéraux 2c, 3c présentent également un profil convexe. As is more particularly apparent from FIGS. 1 to 4, the subject of the invention relates to a prosthesis in particular lumbar 1 intended to be implanted in place of a disc between two adjacent vertebrae. The disc prosthesis 1 according to the invention comprises a first plate 2 said upper in the illustrated example and a second plate 3 said lower. The plates 2, 3 are intended to be attached to neighboring vertebrae and each has an outer face respectively 21, 31 of substantially similar dimensions and adapted to approximately match the contour of the associated articular surfaces. Each plate 2, 3, also has an inner face 22 and 32, respectively, extending in facing relation to each other. Each plate 2, 3 has a posterior edge respectively 2a, 3a extending opposite an anterior edge 2b, 3b respectively. The front edge 2b, 3b of each plate 2, 3 is connected to the respective rear edge 2a, 3a with the aid of two side edges 2c, 3c opposite one another. Preferably, in a transverse plane T perpendicular to the sagittal plane S in consideration of the anatomical planes, the posterior edge 2a, 3a of each plate has a concave profile, while the front edge 2b, 3b has a convex profile. In this same transverse plane T, the lateral edges 2c, 3c also have a convex profile.
La prothèse discale 1 selon l'invention comporte également une rotule d'articulation 4, interposée entre les deux plaques 2 et 3 qui se trouvent montées en position superposée. La rotule d'articulation 4 est constituée par un premier insert 5 présentant une calotte sphérique 6 et par un deuxième insert 7 présentant une cupule sphérique 8 coopérant avec la calotte sphérique 6. Bien entendu, la calotte sphérique 6 présente une forme convexe complémentaire à la forme concave de la cupule sphérique 8. Selon une caractéristique avantageuse de réalisation, la calotte sphérique 6 et la cupule sphérique 8 présentent des dimensions sensiblement identiques légèrement inférieures aux dimensions des plaques. Il doit être compris que les surfaces en contact entre les deux inserts présentent des dimensions optimum permettant de répartir les contraintes imposées. Avantageusement, les inserts 5, 7 sont réalisés en un matériau céramique. The disc prosthesis 1 according to the invention also comprises a hinge joint 4, interposed between the two plates 2 and 3 which are mounted in superposed position. The hinge ball 4 is constituted by a first insert 5 having a spherical cap 6 and a second insert 7 having a spherical cup 8 cooperating with the spherical cap 6. Of course, the spherical cap 6 has a convex shape complementary to the concave shape of the spherical cup 8. According to an advantageous feature of embodiment, the spherical cap 6 and the spherical cup 8 have substantially identical dimensions slightly smaller than the dimensions of the plates. It should be understood that the surfaces in contact between the two inserts have optimum dimensions for distributing the constraints imposed. Advantageously, the inserts 5, 7 are made of a ceramic material.
Selon une caractéristique de l'invention, chaque insert 5, 7 est monté sur une plaque 2, 3 à l'aide d'une liaison glissière 11 et d'une liaison ponctuelle d'arrêt en translation 12. Dans l'exemple préféré de réalisation, la liaison glissière 11 est une liaison du type à queue d'aronde réalisée entre une plaque et un insert. Tel que cela apparaît plus précisément sur les fig. 2 et 3, pour réaliser cette liaison du type à queue d'aronde 11, chaque insert 5, 7 comporte à partir de sa calotte 6 et cupule 8 sphérique, un talon 13 se terminant par une partie en queue d'aronde 14. De préférence, le profil en queue d'aronde s'étend dans une direction parallèle au plan frontal F. Chaque plaque 2, 3 comporte également sur sa face interne 22, 23 un profil 17 en queue d'aronde complémentaire au profil en queue d'aronde des inserts 5, 7. Tel que cela ressort plus précisément des fig. 3 et 4, chaque insert 5, 7 est bloqué en translation dans la direction frontale dans l'exemple illustré, par l'intermédiaire de la liaison ponctuelle 12 constituée par un téton d'arrêt 21 traversant un alésage 22 réalisé dans chaque plaque 2, 3 et débouchant dans un trou borgne 25 aménagé dans chaque insert. Il peut ainsi être obtenu un blocage efficace et sûr de l'insert tout en permettant la réalisation d'un insert avec les dimensions suffisamment grandes pour encaisser les efforts dus aux sollicitations axiales exercées sur la prothèse. According to one characteristic of the invention, each insert 5, 7 is mounted on a plate 2, 3 by means of a sliding connection 11 and a translation stop fixed link 12. In the preferred embodiment of FIG. embodiment, the slide connection 11 is a connection of the dovetail type made between a plate and an insert. As it appears more precisely in FIGS. 2 and 3, to make this dovetail type connection 11, each insert 5, 7 comprises from its cap 6 and spherical cup 8, a heel 13 ending in a dovetail portion 14. Preferably, the dovetail profile extends in a direction parallel to the frontal plane F. Each plate 2, 3 also has on its inner face 22, 23 a dovetail profile 17 complementary to the tail profile. dovetail of the inserts 5, 7. As is more clearly apparent from FIGS. 3 and 4, each insert 5, 7 is locked in translation in the frontal direction in the illustrated example, by means of the point connection 12 constituted by a stop pin 21 passing through a bore 22 made in each plate 2, 3 and opening into a blind hole 25 arranged in each insert. It can thus be obtained an effective and safe blocking of the insert while allowing the realization of an insert with the dimensions large enough to withstand the forces due to axial stresses exerted on the prosthesis.
Selon une caractéristique préférée de réalisation, un élément d'amortissement non représenté est interposé entre chaque insert 5, 7 et une plaque 2, 3 pour permettre d'amortir les sollicitations axiales exercées sur la prothèse. According to a preferred embodiment, a damping element (not shown) is interposed between each insert 5, 7 and a plate 2, 3 to allow damping the axial stresses exerted on the prosthesis.
Selon une autre caractéristique avantageuse de réalisation, la prothèse 1 est pourvue également d'une membrane élastique 30 entourant au moins partiellement la rotule 4 en étant fixé aux deux plaques 2, 3 de manière que ces dernières soient liées entre elles. Cette membrane élastique 30 réalisée par exemple en un matériau polymère est fixée par tout moyen approprié sur les plaques 2 et 3. Cette membrane élastique 30 permet de maintenir entre elles les deux plaques de fixation 2, 3. De préférence, cette membrane élastique 30 est continue sur tout le pourtour de la prothèse qui se présente ainsi sous la forme d'un élément complètement fermé. According to another advantageous embodiment, the prosthesis 1 is also provided with an elastic membrane 30 at least partially surrounding the ball 4 being fixed to the two plates 2, 3 so that the latter are bonded together. This elastic membrane 30 made for example of a polymer material is fixed by any appropriate means on the plates 2 and 3. This elastic membrane 30 serves to maintain between them the two fixing plates 2, 3. Preferably, this elastic membrane 30 is continues all around the prosthesis which is thus in the form of a completely closed element.
L'invention n'est pas limitée aux exemples décrits et représentés car diverses modifications peuvent y être apportées sans sortir de son cadre The invention is not limited to the examples described and shown because various modifications can be made without departing from its scope
Claims (4)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0312144A FR2860974B1 (en) | 2003-10-17 | 2003-10-17 | PROSTHESIS LUMBAR DISC |
| US10/962,999 US20050113925A1 (en) | 2003-10-17 | 2004-10-12 | Lumbar disc prostheses |
| PCT/FR2004/002596 WO2005037148A1 (en) | 2003-10-17 | 2004-10-13 | Lumbar disk prosthesis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0312144A FR2860974B1 (en) | 2003-10-17 | 2003-10-17 | PROSTHESIS LUMBAR DISC |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2860974A1 true FR2860974A1 (en) | 2005-04-22 |
| FR2860974B1 FR2860974B1 (en) | 2006-06-16 |
Family
ID=34385237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR0312144A Expired - Fee Related FR2860974B1 (en) | 2003-10-17 | 2003-10-17 | PROSTHESIS LUMBAR DISC |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20050113925A1 (en) |
| FR (1) | FR2860974B1 (en) |
| WO (1) | WO2005037148A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006128509A1 (en) * | 2005-06-03 | 2006-12-07 | Mathys Ag Bettlach | Intervertebral disk implant |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4601051B2 (en) * | 2004-12-20 | 2010-12-22 | 株式会社ユニバーサルエンターテインメント | Gaming chips |
| US8556973B2 (en) * | 2006-02-10 | 2013-10-15 | DePuy Synthes Products, LLC | Intervertebral disc prosthesis having multiple bearing surfaces |
| US20070233244A1 (en) * | 2006-03-28 | 2007-10-04 | Depuy Spine, Inc. | Artificial Disc Replacement Using Posterior Approach |
| US8282641B2 (en) | 2006-03-28 | 2012-10-09 | Depuy Spine, Inc. | Methods and instrumentation for disc replacement |
| US8137404B2 (en) * | 2006-03-28 | 2012-03-20 | Depuy Spine, Inc. | Artificial disc replacement using posterior approach |
| US8715352B2 (en) * | 2006-12-14 | 2014-05-06 | Depuy Spine, Inc. | Buckling disc replacement |
| US8172902B2 (en) * | 2008-07-17 | 2012-05-08 | Spinemedica, Llc | Spinal interbody spacers |
| US9066809B2 (en) * | 2009-05-15 | 2015-06-30 | Globus Medical Inc. | Method for inserting and positioning an artificial disc |
| CN106726022B (en) * | 2017-02-22 | 2019-06-18 | 无锡宝莱福医疗器械有限公司 | An artificial intervertebral disc without interfacial friction and its forming method |
| CN106901876B (en) * | 2017-02-22 | 2019-03-01 | 无锡宝莱福医疗器械有限公司 | A kind of biomimetic type artificial intervertebral disk and its forming method |
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| US5314477A (en) * | 1990-03-07 | 1994-05-24 | J.B.S. Limited Company | Prosthesis for intervertebral discs and instruments for implanting it |
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Also Published As
| Publication number | Publication date |
|---|---|
| FR2860974B1 (en) | 2006-06-16 |
| WO2005037148A1 (en) | 2005-04-28 |
| US20050113925A1 (en) | 2005-05-26 |
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| Date | Code | Title | Description |
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| ST | Notification of lapse |
Effective date: 20160630 |